EIGENMANN: THE PYGIDIID^E, A FAMILY OF SOUTH AMERICAN CATFISHES. 285 



This specimen is one of those mentioned by Evermann and Kendall in the 

 paper quoted above. It differs from P. areolatum as described by Cuvier and 

 Valenciennes, whose specimen came from Chile, west of the Ancles. The origin of 

 the dorsal is farther back, and its last ray is beyond the last ray of the anal. 



Head 6.33; depth 6.5; D. 17.5 (3 and 14.5); A. 9.5, counting the minute im- 

 bedded rays in each case; P. 9; front margin of the eye in the middle of the head; 

 intcrocular a little over three times in the length of the head, eye three in the inter- 

 ocular. Teeth very narrow chisels ; nasal barbel reaching to above first intcropercular 

 spines, maxillary barbel to middle of opercular spines. Pectoral rounded, its first 

 ray not prolonged, nearly two-thirds the length of the head; origin of the ventrals 

 equidistant from snout and last fifth of the middle caudal rays; first anal ray under 

 the sixth dorsal ray, the last anal ray under the fourth from the last ray of the 

 dorsal; distance between anal and caudal 4.75 times in the length; origin of dorsal 

 equidistant from tip of caudal and middle of pectorals, its distance from the caudal 

 two times in its distance from the snout. 



Sides without distinct markings; faint traces of longitudinal lines. 



This specimen differs from a specimen of H. areolata in the Harvard Museum, 

 in which the last dorsal ray is over the fourth ray of the anal. In a specimen of 

 areolata in the British Museum drawn by J. Green, the last dorsal ray is over the 

 penultimate anal ray. 



4. Hatcheria areolata (Cuvier & Valenciennes). 

 Native name "Bagre." 



Trichomycterus areolatus Cuvier & Valenciennes, Hist. Nat. Poiss., XVIII, 1846, 



p. 492 (coast of Chile); Guichenot, in Gay, Hist. Chile, II, 1848, p. 309; 



Gunther, Cat. Fishes Brit, Mus., V, 1864, p. 274 (Chile); Philippi, Mb. Ak. 



Wiss. Berlin, 1866, p. 714; Delfin, Catalogo de los Peces de Chile, 1901, p. 30. 

 Pygidium areolatum Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. (2), II, 1889, 



p. 51 (Rio Mapocho, Chile); Occasional Papers Cal. Acad. Sci., I, 1890, p. 330; 



Proc. U. S. Nat. Mus., XIV, 1891, p. 30; ? Berg, An. Mus. Nac. Buenos Aires, 



IV, 1895, p. 143 (Arroyo del Tala, Catamarca, Argentina). 

 Hatcheria areolata Eigenmann, Reports Princeton Univ. Exped. Patagonia, III, 



1909, p. 251, pi. XXXIV, fig. 2; 1910, p. 399. 

 Thrichomycterus maculatus Girard, part; U. S. Naval and Astron. Exped., 1855, 



p. 243 (Mapocho). 



Habitat. — Pacific slope of Central Chile; ? Catamarca, Argentina. 



It is doubftul whether the specimens mentioned by Berg, which had come from 



